Document
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The special collection scheme (SSG) was established in 1956 and developed parallel to the North Rhine-Westphalian union Catalogue. In 1960 the first printed alphabetical current catalogue of SSG literature was produced, listing 3.500 titles but not including all participating libraries. The range of the catalogue increased over the next 10 years; it is considered successful since statistics showed increased loans of listed material. Despite larger numbers of colleges and universities in North-Rhine Westphalia, SSG and its catalogues should survive: SSG allows small libraries to participyte aid. SSG has contributed to library development in North-Rhine Westphalia